Question

An organic compound contains carbon, hydrogen and oxygen. Its elemental analysis gave C, 40% and H, 6.67% by mass. The empirical formula of the compound will be

Answer 1

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An organic compound contains carbon, hydrogen and oxygen . Its elemental analysis gave C, $38.71\%$ and $H, 9.67 \%$ The empirical formula of the compound would be

$ (a)\;CHO \\(b)\;CH_4O \\ (c)\;CH_3O \\ (d)\;CH_2O $

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Step 1. If you have masses go onto step 2. If you have % composition of the elements. Assume the mass to be 100g, so the % becomes grams.

Step 2. Determine the moles of each element.

Step 3. Determine the mole ratio by dividing each elements no. of moles by the smallest value from step 2.

Step 4. Double, triple, … to get an integer if they are not all whole numbers



Hence the empirical formula of the compound would be $CH_3 O$

Hence c is the correct answer.

Answer 2

Answer:

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